Mathematical model of the mechanical effect of picosecond laser radiation in high-frequency pulsation mode in creating microstructures by special laser milling

Dmitry A. Bessonov; Yuri V. Chebotarevsky; Adil K. Klushev; Tatiana N. Sokolova; Elena L Surmenko

doi:10.1117/12.2625323

29 April 2022 Mathematical model of the mechanical effect of picosecond laser radiation in high-frequency pulsation mode in creating microstructures by special laser milling

Dmitry A. Bessonov, Yuri V. Chebotarevsky, Adil K. Klushev, Tatiana N. Sokolova, Elena L Surmenko

Author Affiliations +

Proceedings Volume 12193, Laser Physics, Photonic Technologies, and Molecular Modeling; 121930I (2022) https://doi.org/10.1117/12.2625323
Event: XXV Annual Conference Saratov Fall Meeting 2021; and IX Symposium on Optics and Biophotonics, 2021, Saratov, Russian Federation

Abstract

A package mode of laser operation is considered, when packets of several picosecond pulses follow with a lag of each other of nanoseconds order (high-frequency pulsation mode). In this mode removal of matter from the treated surface generates a pulsed reactive force. This force creates a high-pressure region in the laser-matter interaction zone, causing plastic deformations in metals or destruction of brittle materials both inside this area and outside it. In order to minimize the negative effect of the processing mode, an analytical tool has been developed for the deliberate choice of parameters of laser action on brittle and pseudo-brittle materials. In the proposed mathematical model, the study of the stress-strained state of the plate is reduced to determining the deflection of its median plane by solving the dynamic problem of the theory of elasticity. Analysis of the expression for the deflection showed that with the considered nature of the action of laser radiation, a complex high-frequency oscillatory motion arises in the plate. It represents the result of the superposition of natural and forced oscillations. When choosing the technological modes of laser processing during the formation of pulse packets, the multiplicity of the repetition rates of the packets and their constituent pulses should be avoided in order to prevent a destructive shock resonance. The paper shows the application of the developed model to the calculation of the modes of laser processing of glassy carbon and molybdenum when creating micropoint structures.

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Dmitry A. Bessonov, Yuri V. Chebotarevsky, Adil K. Klushev, Tatiana N. Sokolova, and Elena L Surmenko "Mathematical model of the mechanical effect of picosecond laser radiation in high-frequency pulsation mode in creating microstructures by special laser milling", Proc. SPIE 12193, Laser Physics, Photonic Technologies, and Molecular Modeling, 121930I (29 April 2022); https://doi.org/10.1117/12.2625323

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KEYWORDS

Picosecond phenomena

Mathematical modeling

Laser applications

Molybdenum

Pulsed laser operation

Laser processing

Metals

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